Apache Solr Reference Guide Covering Apache Solr 6.0

Example:
In: "The The"
Tokenizer to Filter: "the"(1), "the"(2)
Out: "the"(2)
Synonym Filter
This filter does synonym mapping. Each token is looked up in the list of synonyms and if a match is found, then
the synonym is emitted in place of the token. The position value of the new tokens are set such they all occur at
the same position as the original token.
Factory class: solr.SynonymFilterFactory
Arguments:
synonyms: (required) The path of a file that contains a list of synonyms, one per line. In the (default) solr forma
t - see the format argument below for alternatives - blank lines and lines that begin with "#" are ignored. This
may be an absolute path, or path relative to the Solr config directory. There are two ways to specify synonym
mappings:
A comma-separated list of words. If the token matches any of the words, then all the words in the list are
substituted, which will include the original token.
Two comma-separated lists of words with the symbol "=>" between them. If the token matches any word
on the left, then the list on the right is substituted. The original token will not be included unless it is also in
the list on the right.
ignoreCase: (optional; default: false) If true, synonyms will be matched case-insensitively.
expand: (optional; default: true) If true, a synonym will be expanded to all equivalent synonyms. If false, all
equivalent synonyms will be reduced to the first in the list.
format: (optional; default: solr) Controls how the synonyms will be parsed. The short names solr (for SolrS
ynonymParser) and wordnet (for WordnetSynonymParser ) are supported, or you may alternatively supply
the name of your own SynonymMap.Builder subclass.
tokenizerFactory: (optional; default: WhitespaceTokenizerFactory) The name of the tokenizer factory
to use when parsing the synonyms file. Arguments with the name prefix " tokenizerFactory." will be
supplied as init params to the specified tokenizer factory. Any arguments not consumed by the synonym filter
factory, including those without the " tokenizerFactory. " prefix, will also be supplied as init params to the
tokenizer factory. If tokenizerFactory is specified, then analyzer may not be, and vice versa.
analyzer: (optional; default: WhitespaceTokenizerFactory) The name of the analyzer class to use when
parsing the synonyms file. If analyzer is specified, then tokenizerFactory may not be, and vice versa.
For the following examples, assume a synonyms file named mysynonyms.txt:
Apache Solr Reference Guide 6.0
138